“…Some projects have applied metadata quality metrics, particularly those related to completeness -the third most important metadata quality criterion (Park, 2009) -into production systems. These projects include, for example, those presented in Zavalina, Alemneh, Kizhakkethil, Phillips and Tarver, 2015;Király and Büchler, 2018, etc. Aggregations that bring together metadata from different sources inevitably face problems with metadata quality, and because of this, evaluation of metadata gains more and more importance (Hillmann, 2008). Thus, several studies, in their analysis of large collections of metadata, focused on counting instances of data values in metadata and then performing standard descriptive statistics on these counts to better understand collections in an aggregated environment.…”